:root {
  /* ---- Colour: navy, white, neutral grey ---- */
  --navy-900: #0a1a2b;
  --navy-800: #10263c;
  --navy-700: #17364f;
  --ink:        #17222e;
  --ink-soft:   #455568;
  --ink-mute:   #66727f;
  --line:        #e2e7ed;
  --line-strong: #c8d1db;
  --paper:      #ffffff;
  --paper-alt:  #f7f9fb;
  --accent:     #1c4f7c;
  --focus:      #2f7ac2;

  /* ---- Typography: system fonts only ---- */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
               "Liberation Mono", monospace;

  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-lg:   1.0625rem;
  --fs-xl:   1.25rem;
  --fs-2xl:  1.625rem;
  --fs-h1:   clamp(2rem, 4vw, 2.75rem);
  --fs-hero: clamp(2.25rem, 5.5vw, 3.5rem);

  /* ---- Spacing scale ---- */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;

  /* ---- Layout ---- */
  --container: 1100px;
  --gutter: 1.5rem;
  --radius: 2px;
  --border: 1px solid var(--line);
}

/* -----------------------------------------------------------------------
   Base
   ----------------------------------------------------------------------- */

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

main { flex: 1 0 auto; }

img { display: block; max-width: 100%; height: auto; }

h1, h2, h3, h4 {
  margin: 0 0 var(--sp-4);
  color: var(--navy-900);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-h1); letter-spacing: -0.02em; }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-lg); }

p { margin: 0 0 var(--sp-4); }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--navy-900); }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 1px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 20;
  padding: var(--sp-2) var(--sp-4);
  background: var(--navy-900);
  color: #ffffff;
  font-size: var(--fs-sm);
  text-decoration: none;
}
.skip-link:focus { left: var(--sp-4); top: var(--sp-4); color: #ffffff; }

/* -----------------------------------------------------------------------
   Header and navigation
   ----------------------------------------------------------------------- */

.site-header {
  border-bottom: var(--border);
  background: var(--paper);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3) var(--sp-6);
  padding-block: var(--sp-3);
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--navy-900);
  text-decoration: none;
}
.brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}
.brand-name {
  font-size: var(--fs-xl);
  font-weight: 600;
  letter-spacing: 0.03em;
}
.brand:hover { color: var(--navy-800); }

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: inline-block;
  padding: var(--sp-1) 0;
  border-bottom: 2px solid transparent;
  color: var(--ink-soft);
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.site-nav a:hover {
  color: var(--navy-900);
  border-bottom-color: var(--line-strong);
}
.site-nav a[aria-current="page"] {
  color: var(--navy-900);
  border-bottom-color: var(--navy-700);
  font-weight: 600;
}

/* -----------------------------------------------------------------------
   Homepage hero
   ----------------------------------------------------------------------- */

.hero {
  padding-block: clamp(3rem, 8vw, 5.5rem) clamp(2.5rem, 6vw, 4rem);
  border-bottom: var(--border);
}

.eyebrow {
  margin: 0 0 var(--sp-4);
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 22ch;
  margin-bottom: var(--sp-5);
  font-size: var(--fs-hero);
}

.lead {
  max-width: 64ch;
  color: var(--ink-soft);
  font-size: var(--fs-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3) var(--sp-4);
  margin-top: var(--sp-6);
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--fs-sm);
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease,
              color 0.15s ease;
}
.button--primary {
  background: var(--navy-800);
  color: #ffffff;
}
.button--primary:hover {
  background: var(--navy-900);
  color: #ffffff;
}
.button--secondary {
  border-color: var(--line-strong);
  color: var(--navy-800);
}
.button--secondary:hover {
  border-color: var(--navy-700);
  color: var(--navy-900);
}

/* -----------------------------------------------------------------------
   Sections
   ----------------------------------------------------------------------- */

.section {
  padding-block: clamp(2.5rem, 5vw, 3.75rem);
  border-bottom: var(--border);
}
.section:last-of-type { border-bottom: 0; }

.section-action { margin: var(--sp-5) 0 0; font-size: var(--fs-sm); }

.page-head {
  padding-block: clamp(2.75rem, 6vw, 4.25rem) clamp(1.5rem, 3vw, 2rem);
  border-bottom: var(--border);
}
.page-head h1 { margin-bottom: var(--sp-4); }
.page-head .lead { margin: 0; max-width: 70ch; }

/* -----------------------------------------------------------------------
   Focus areas
   ----------------------------------------------------------------------- */

.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-6);
  margin: 0;
  padding: 0;
  list-style: none;
}

.focus-item {
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line-strong);
}

.index-label {
  display: block;
  margin-bottom: var(--sp-3);
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
}

.focus-item h3 { margin-bottom: var(--sp-2); }
.focus-item p {
  margin: 0;
  max-width: 40ch;
  color: var(--ink-soft);
}

/* -----------------------------------------------------------------------
   Principles
   ----------------------------------------------------------------------- */

.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-6);
  margin: 0;
  padding: 0;
  list-style: none;
}

.principle {
  padding-left: var(--sp-4);
  border-left: 2px solid var(--navy-700);
}
.principle h3 { margin-bottom: var(--sp-2); }
.principle p { margin: 0; color: var(--ink-soft); }

/* -----------------------------------------------------------------------
   Empty state and notice blocks
   ----------------------------------------------------------------------- */

.empty-state {
  padding: var(--sp-5);
  border: var(--border);
  border-radius: var(--radius);
  background: var(--paper-alt);
}
.empty-state h2,
.empty-state h3 {
  margin-bottom: var(--sp-2);
  font-size: var(--fs-lg);
}
.empty-state p {
  max-width: 70ch;
  margin: 0;
  color: var(--ink-soft);
}

.note {
  max-width: 68ch;
  color: var(--ink-soft);
}

/* -----------------------------------------------------------------------
   Research / project entries
   (used when real entries are added; see the commented templates)
   ----------------------------------------------------------------------- */

.entries {
  margin: 0;
  padding: 0;
  list-style: none;
}

.entry {
  padding-block: var(--sp-5);
  border-top: var(--border);
}
.entry:last-child { border-bottom: var(--border); }

.entry-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-4);
}

.entry-title {
  margin: 0;
  font-size: var(--fs-xl);
}

.entry-summary {
  max-width: 70ch;
  margin: var(--sp-3) 0;
  color: var(--ink-soft);
}

.entry-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
  margin: 0;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.entry-meta a { text-transform: none; letter-spacing: 0; }

.status {
  display: inline-block;
  padding: 1px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* -----------------------------------------------------------------------
   About page
   ----------------------------------------------------------------------- */

.prose { max-width: 68ch; }
.prose p { color: var(--ink-soft); }
.prose p:last-child { margin-bottom: 0; }

.people {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--sp-6);
  margin: var(--sp-5) 0 0;
  padding: 0;
  list-style: none;
}

.person {
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line-strong);
}

.person-name {
  margin: 0 0 var(--sp-1);
  color: var(--navy-900);
  font-weight: 600;
}

.person-role {
  margin: 0 0 var(--sp-2);
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.person-note {
  margin: 0;
  color: var(--ink-mute);
  font-size: var(--fs-sm);
}

.placeholder {
  color: var(--ink-mute);
  font-style: italic;
  font-weight: 400;
}

.contact-list {
  margin: var(--sp-5) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--border);
}

.contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-5);
  padding-block: var(--sp-3);
  border-bottom: var(--border);
}

.contact-label {
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.contact-value {
  color: var(--ink-soft);
  font-size: var(--fs-sm);
}

/* -----------------------------------------------------------------------
   Footer
   ----------------------------------------------------------------------- */

.site-footer {
  background: var(--navy-900);
  color: #c9d3de;
}
.site-footer .container { padding-block: var(--sp-7) var(--sp-4); }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  gap: var(--sp-6);
}

.footer-brand {
  margin: 0 0 var(--sp-3);
  color: #ffffff;
  font-size: var(--fs-xl);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.footer-text {
  max-width: 48ch;
  margin: 0;
  color: #a9b6c4;
  font-size: var(--fs-sm);
}

.footer-heading {
  margin: 0 0 var(--sp-3);
  color: #8fa0b2;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav a {
  color: #c9d3de;
  font-size: var(--fs-sm);
  text-decoration: none;
}
.footer-nav a:hover {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-bottom {
  margin-top: var(--sp-6);
  padding-top: var(--sp-4);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.footer-bottom p {
  margin: 0;
  color: #8fa0b2;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
}

/* -----------------------------------------------------------------------
   Responsive
   ----------------------------------------------------------------------- */

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
    padding-block: var(--sp-4);
  }

  .site-nav ul { gap: var(--sp-2) var(--sp-4); }
  .site-nav a { font-size: var(--fs-xs); }

  .footer-grid { grid-template-columns: 1fr; }

  .hero-actions { gap: var(--sp-3); }
  .button { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

/* People — photos and links */
.person-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  margin-bottom: var(--sp-3);
  border: var(--border);
  border-radius: var(--radius);
  background: var(--paper-alt);
}

.person-name { margin-bottom: var(--sp-1); }
.person-role { margin-bottom: var(--sp-3); }
.person-note { margin-bottom: 0; }

.person-links {
  margin: var(--sp-3) 0 0;
}

.person-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--ink-soft);
  font-size: var(--fs-sm);
  text-decoration: none;
}
.person-links a:hover { color: var(--accent); }
.person-links svg { flex: none; }